Thermodynamic properties of heavy n-alkanes in the liquid state: n-tridecane

Approach to Improve Speed of Sound Calculation within PC-SAFT Framework

“…16,59 The vapor pressure and saturated liquid density data is taken from the DIPPR correlations 50 in the reduced temperature range [0.45, 0.9] for consistency and easy comparison with other models, while the speed of sound data of methane to n-decane is taken from the NIST database, 51 and those of other long chain molecules are taken from the literature. [52][53][54][55][56][57][58]60,61 The typical shapes of the constant temperature speed of sound curves from the three models are shown in Figures 1−3, from which it can be seen that sPC-SAFT performs better on capturing the curvature, although SRK or CPA have a better % AAD in narrow low pressure ranges for some cases, such as hexane at 300 K in Figure 2. This is because the cancellation of the errors from the underpredicted to overpredicted regions.…”

Composition measurements of crude oil and process water emulsions using thick-film ultrasonic transducers

“…It can be seen from Table 4 that C p for hydrocarbons is typically in the range of 2.2-2.4 kJ kg −1 K −1 while the ratio of the specific heat capacities, µ, is typically in the range 1.18-1.30. Table 4 Numerical values of specific heat capacities for selected hydrocarbons [17][18][19][20] and distilled water [17], at pressure 0.1 MPa The latter is significant from the viewpoint of model (v) because the magnitude of parameter θ (see Table 3) depends on the magnitude of factor (µ − 1), which is relatively small for fluids such as distilled water but becomes very large for hydrocarbons discussed here. Table 4.…”

“…Table 4 contains the values of specific heat capacities for selected hydrocarbons obtained from Refs. [17][18][19][20] and for distilled water [17], at pressure 0.1 MPa. Crude oil such as used in the experiments reported here is usually a mixture of various hydrocarbons and it is expected that its properties will be broadly similar.…”

Equations of State on Demand: Application for Surrogate Fuel Development

“…1(a) Deviations of experimental vapor-pressure data[72,77] from the Helmholtz EOS for n-tridecane, (b) deviations of experimental liquid-density data[78,80,97,98] from the Helmholtz EOS for n-tridecane, (c) deviations of experimental liquid heat-capacity data[97,99,100] from the Helmholtz EOS for n-tridecane, and (d) deviations of experimental liquid sound-speed data[97,101,102] from the Helmholtz EOS for n-tridecaneTerres et al, 1959 Fig 2. Deviations of experimental vapor-pressure data[70] from the PR EOS for 3-methylundecane…”